Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1987-09-14
1988-05-31
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 912
Patent
active
047472170
ABSTRACT:
A carpenter's level is described which includes an inclination indicator mounted in the web of an I-beam shaped frame. The inclination indicator includes a pair of transparent window panels affixed on each side of the web to enclose an aperture in the web, the window panels having interiorly directed sockets for holding the pin upon which a pendulum swings. Indicia is imprinted on the inside face of the window panels so that it will not wear off. Bolt holes through the window panels and web positively seat the window panels in alignment with the level's faces. Adjustment screws through the pivot shaft apertures at the center of each of the window panels enable axial adjustment of the pendulum and pivot shaft.
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Levels, by Joseph Truini, Popular Mechanics, Jun. 1987, pp. 95, 96, 97, 144.
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